Circular knitting machine



FIG. 1 is a top perspective view of a circular knitting machine showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear elevational view thereof; and

FIGS. 7 and 8 are opposite end views thereof. 

The ornamental design for a circular knitting machine, substantially, as shown. 